BYY一91型遇水膨胀止水条，系90年代新型计学建筑防水材料。吸水膨胀率达300～500％。核材料主要解决地下工程的渗漏问题，用于建筑物或往筑物混凝土施工缝的密封止水。其原理是预置于渗漏水缝隙内部的该止水条在约束条件下I‘即被混凝土包裹的状态F）通水膨胀，主动出击，将缝 BYY a 91 water expansion seal, the Department of the new 90’s building materials waterproofing. Water swelling rate of 300 ~ 500%. Nuclear materials to solve the problem of leakage of underground works, used to seal the building or building construction joints sealing water. The principle is preset in the water leakage gap within the water stop under the constraints I ’is wrapped in concrete state F) water swelling, take the initiative, the seam